verb (used with object), underran, underrun, underrunning.
to run, pass, or go under.
Nautical. to pass beneath (a stretched rope, net, etc.) in a boat or the like for the purpose of inspection or repairs.
something that runs or passes underneath, as a current.
an instance of costing or spending less than estimated.
a production run of a manufactured or printed item below the quantity ordered.

1540–50; under- + run

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The price: several recordable disks ruined because of buffer underrun.
One problem is to avoid the underrun type collisions with the safety bumper.
If the actual rate is less than the planned rate, too little mix is being
  placed and there is an underrun.
The percentage of underrun or overrun should be substantial enough to warrant
  contract time changes.
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